types_of_people = 10    # 定义有10类人
x = f"There are {types_of_people} types of people."    # 定义x代表字符串“有10类人”

binary = "binary"    # 定义字符串变量“binary”
do_not = "don't"    # 定义don't
y = f"Those who know {binary} and those who {do_not}."    # 定义y代表字符串有二元的和不是二元的

print (x)    # 打印字符串有10类人
print (y)    # 打印字符串y

print (f"I said: {x}")    # 打印字符串 我说x
print (f"I also said: '{y}'")    # 打印字符串，我也说y

hilarious = False    # 定义热闹为错
joke_evaluation = "Isn't that joke so funny? {}!"    # 定义字符串 这个笑话好笑么？

print (joke_evaluation.format(x))    # 打印字符串和他的引用

w = "This is the left side of..."   # 定义w代表的字符串
e = "a string with a right side."   # 定义e代表的字符串

print (w + y )    # 打印w和e字符串组合。
